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+ rte --r a - t� Y c £ s'; 4 .. a � m3-zee• _: r .= x. , ti , s,n. < COOPERATIVE EXTENSION UNIVERSITY OF CALIFORNIA Call9fornia . Poultry Letter December, 1992 MONITORING MITES CAN Fowl Mite. On some farms, the cost of REDUCE CONTROL COSTS mite control exceeds that for fly control. Effects on production resulting from mite In the past, several factors have led to infestations in laying flocks are not well poor control. Young pullets are difficult documented. Numerous anecdotal reports to treat because of their heavily feathered of lowered egg production rates are vent area. Inadequate spray pressure, or available; but controlled experimentation use of an improper spray nozzle can has yielded mixed results. E. C. Loomis, prevent the pesticide from reaching the et al. (1970) monitored several groups of targeted vent area. Over use of certain hens with varying degrees of mite pesticides has led to pesticide resistance in infestation for indications of anemia and the field. Waiting too long to treat can depressed egg production; neither could lead to very heavy infestations that are be demonstrated. De Vaney (1978), on difficult to control. the other hand, demonstrated production losses between 5 and 15 percent in heavily The availability of new effective pesticides infested hens (>1000 mites per hen). does not look promising, especially in California. Relatively speaking, pesticide The human annoyance factor can hardly sales for mite control, would be a low be disputed. Handling of birds that are volume product for a pesticide infested, or their eggs can result in the manufacturer. Manufacturers are less transfer of mites on to the skin of workers. likely today to spend the necessary money For some, who are sensitive, this can cause on getting a chemical approved when the skin irritation and sometimes allergic anticipated sales volume is low. reactions. There is some documentation of allergic reactions in workers who have In general, the livestock industries will inhaled mites, or parts of them. have to find ways to control pests with fewer and older pesticides. This For whatever reason, perceived loss of underlines the importance of efficient production efficiency, or worker control methods. When using these older complaints, most poultrymen spend a chemicals, over use will likely result in significant portion of their pest further resistance, and under use will management costs on controlling Northern result in heavy infestations. In accordance with applicable Federal laws and University policy,the University of California does not discriminate in any of its policies,procedures or practices on the basis of race,religion,color,national origin,sex,marital status,sexual orientation,age,veteran status,medical condition(as defined in section 12926 of the California Government Code)or handicap.Inquiries regarding the University's equal opportunity policy may be addressed to the Affirmative Action Director,Agriculture and Natural Resources,University of California,300 Lakeside Drive,Sixth Floor,Oakland,CA 94612-3560,(415)987-0097. "